Piezoelectric properties of (Na0.465K0.465Bi0.07)(Nb0.93Ti0.07)O3 ceramics with MnO2 addition

In this study, (Na0.465K0.465Bi0.07)(Nb0.93Ti0.07)O-3 ceramics with MnO2 addition were prepared by conventional mixed oxide method. The effects of MnO2 addition on the structural and electrical properties of the specimens were investigated for the application of piezoelectric devices. As the results of X-ray diffraction analysis, all specimens showed the typical polycrystalline perovskite structure without presence of the second phase. Sintered densities increased with increasing the addition amount of MnO2 and the specimen added with 0.06 mol% of MnO2 showed the maximum value of 4.87 g/cm(3). Average grain size increased and densification increased with an increasing of MnO2 contents. The electromechanical coupling factor, dielectric constant, dielectric loss, d(33) and Curie temperature of the 0.06 mol% of MnO2 doped (Na0.465K0.465Bi0.07)(Nb0.93Ti0.07)O-3 specimens were 0.32, 1309, 0.016, 122 and 465 A degrees C, respectively.